Doh! All of a sudden, my 2G iPod batteries only last 2 hours per charge. Just a few weeks ago I swear it runs up to 4 hours (out of the box it runs up to 8 hours per charge). While searching on the internet for a replacement battery, I came across Newer Tech, that sells user replaceable batteries (at least user replaceable for the 1G & 2G iPods, I think the newer iPods enclosures are more delicate) that runs up to 2x the duration of the original batteries!
I'll be deciding which capacity to get soon. Maybe even a new iPod but I doubt it. I still like the design of the 1G & 2G iPods better than the new ones.